Condenser-shaft regulator



Jan. 29, 1929. 1,700,150

A. J. TRUELSON CONDENSER SHAFT REGULATOR Filed Sept. 12. 1927 m ziww Guam.

Patented Jan. 29, 1929.

PATENT OFFICE.

ARTHUR J. TBUELSON, OF SALT LAKE CITY, UTAH.

CONDENSER-SHAFT REGULATOR.

Application filed September 12, 1927'. Serial No. 218,868.

relates to radio receiving apparatuses, and has for its object to provide a new and eliicient means of moving and regulating the shafts controlling the variable condensers and the comiensers themselves through the medium of one dial and one hand knob.

A further object is to provide a set of pivoted parallel arms which will be actuated by the hand knob and which will, in turn, actuate and rotate the shafts of the condensers so that when the knob is rotated by the operator the condensers are each and every one moved the same amount the same time with no loss of movement.

A still further object is to provide a dial movement which will move the shafts of all of the condensers in the receiving apparatus with a simple and economically constructed set of parallel arms joining each condenser with the dial directly and so that one control knob will be all that is necessary to move and tune in the condensers of the receiving set and to reduce the costs of constructing the set.

These objects I accomplish with the device illustrated in the accompanying drawings in which similar numerals and letters of reference indicate like parts throughout the several views and as described in the specification forming a part of this application and pointed out in the appended claims.

In the drawings, in which I have shown the best and most preferred manner of build ing my invention, Figure 1 is a front view of the dial and the controlling parallel arms. Figure 2 is an end view of the same, parts sectioned. Figure 3 is a plan view of the dial, parts cut away.

In the drawings I have shown the dial A, the teeth around its outer edge as B, the gear driving the dial as C, and the hand knob to rotate the gear C as D. The said hand knob is mounted on a shaft 1, which shaft is carried in a bushing 2 placed in the front panel F of the radio set. The gear C is mounted on the end thereof and is provided with pressure plates 3 and l adapted to press against the sides of the dial. to take up the back lash in the gears. The said dial A is secured on one end of a bushing 5 on one of the condenser shafts 6 and the other shafts 7, S and 9 are each provided with a similar bushing 5. The said bushings are secured to the said shafts either by keyways, pins or set screws or can be made a part thereof, and

My invention each bushing has a lever arm 10 formed on the front end thereof and a similar lever arm 11 formed on the back end thereof parallel with each other but atright angles to each other and at right angles to the bore of the bushing, as shown in Figure 4. The ends of the said lever arms are bored to receive pivot pins or rivets 12, and all of the lever arms 10 are connected with each other by the arm 13, which arm 13 is provided with bosses 1 1 on one side thereof and which bosses are bored to receive the other end of the pivot pins 12. A similar arm 15, having bosses l5" formed thereon, is provided to connect the arms 11. A pin 16 is placed through the said dial A and one of the arms 10 and a bushing or spacer 17 is placed on the said pin 16 between the arm and the dial to provide clearance therebetween. The bushing 5 on the shaft 6 has no lever arm 11 thereon and also he arm 15 has no boss 15 at that point.

The operation of my device is as follows The device is assembled in a radio receiving set and the hand knob D may then be turned in either direction as desired. hen the said knob is turned, the gear C is turned and the dial A rotated by the intermeshing teeth B. As the dial is rotated the pin 16 moves the lever 10 on the bushing 5 of the shaft 6 and as it is rotated the other arms are rotated by the eoacting parallel arms 13 and 15 which are pivoted to the arms 11 and 10, thereby turning the shafts of the condensers. The device will have a maximum movement of 180 degrees and with the two coaeting parallel levers there will be no place in the whole movement where the device will tend to bind or come to dead center.

Having thus described my invention I dcsire to secure by Letters Patent and claim 1. In a device of the class described, the combination of spaced apart parallel arms, having bosses formed on one side of each; bushings carried on shafts, having arms formed thereon at right angles to each other and at right angles to the bore of the bushing; and means to connect said parallel arms and said bosses.

2. In a device of the class described, the combination of spaced apart parallel arms having bosses formed on one side thereof; bushings carried on condenser shafts having arms formed at right angles to each other and on opposite ends of said bushing; connecting pins joining said arms to the bosses on said parallel arms; a dial mounted on one of said bushings; a rivet securing said dial to one of said arms; and means to rotate said dial.

3. In a device of the class described, the combination of spaced apart parallel arms having bosses formed on one side thereof; bushings carried on condenser shafts having arms formed at right angles toeach other and on opposite ends of said bushing; connecting pins joining said arms to said bosses; a dial mounted on one of said bushings; a rivet securing sald d1al to one of said arms; teeth ARTHUR J. TRUELSON. 

